There might be something else at play there as that is quite a long time.Only one gripe, it takes 33 seconds to load on my Win 10 high-end, ssd computer.
About 11 to 12 Sec on a 2008 MacPro
** Edit **
Just noticed @Pa has even longer than the 33 Sec. Strange how differently machines can respond to what should be constants.
I did notice while tinkering with my machine, and it takes a fair bit of tinkering to keep it going, that while DxO doesn't apparently leverage graphics cards a lot, when hardware acceleration is not on, it is basically unusable. So the card installed might be a factor in opening etc.